Method and device for non-invasive ventilation with nasal interface

ABSTRACT

A nasal ventilation interface including a pair of tubes configured to deliver a ventilation gas. The tubes are attachable at a first end to a ventilation gas supply hose and engageable at a second end with a person&#39;s nostril. A coupler is configured to align the pair of tubes with the person&#39;s nostrils, wherein each tube has an absence of pneumatic interconnection with the other tube.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. application Ser. No.12/076,062, filed Mar. 13, 2008, now U.S. Pat. No. 8,136,527, which is adivisional application of U.S. application Ser. No. 10/922,054, filedAug. 18, 2004, now U.S. Pat. No. 7,406,966, which claims priority toU.S. Provisional Patent Application No. 60/495,812 filed Aug. 18, 2003,and U.S. Provisional Patent Application No. 60/511,820 filed Oct. 14,2003, the contents of which are incorporated herein in their entirety.

FIELD OF INVENTION

This invention relates to a non-invasive ventilation (NIV) patientinterface device which provides a route of air entry into a patient'sairway and lung. More particularly, this invention can be applied toObstructive Sleep Apnea (OSA), a condition where the upper airwayobstructs, however the teachings herein are applicable to otherrespiratory conditions.

BACKGROUND OF THE INVENTION

Non-invasive patient interface devices are used in a variety of medicalprocedures, such as emergency ventilation, anesthesia delivery andrecovery, aerosolized medication delivery, augmentation of naturalbreathing, supplemental oxygen delivery, mechanical ventilation, weaningfrom mechanical ventilation and for treating Obstructive Sleep Apnea. Inthe later case continuous positive airway pressure (CPAP) or continuousvariable-level positive airway pressure (VPAP) is delivered through theinterface device into the patient's airway during sleep to preventairway obstruction. OSA is unique to all positive airway pressure (PAP)applications in that the patient is otherwise healthy and the therapyhas to be a minimally obtrusive in order to not disrupt the patientwhile sleeping, whereas in other PAP applications disrupting sleep is ofnegligible concern. There are three different forms of NIV interfacedevices; Nasal Interfaces, Oral Interfaces and combined Oral-NasalInterfaces. Of the Nasal Interface type, there are two categories: NasalMasks and Nasal Interfaces or Cannulae.

Nasal ventilation interface devices are typically used for supplyingsupplemental oxygen gas to a person's lung during their naturalbreathing by placing the tips of the device within the person's nostrilsor nares. These devices are constructed of tubing diameterssubstantially smaller than the diameter of the nostrils since thevolumetric demand for the supplemental oxygen is very low (<2 LPM)negating the need for large bore tubes, and since the user must be ableto breathe room air around the outside of the interface tubes prongswhich are placed in the nostrils.

Oxygen nasal cannulae typically comprise a main base tube positionedhorizontally under the nose from which two prongs extend at right anglesupward and into the nostrils. With some devices, these prongs aredesigned to pinch the nostril septum to facilitate retention andsometimes are tilted toward each other at their tips to facilitatepinching.

Typically, if not always, the base tube has a through lumen and theoxygen supply tubing usually attaches to and extends from both sides ofthis base tube, typically routed around the ears then to the front ofthe neck to secure the apparatus to the patient. In addition to theseoxygen interface tubes, a medical practice has been established to uselarger nasal interface tubes that seal the nostrils in order to providepositive airway pressure (PAP) ventilation therapy. The practice isespecially common in neonates because of the trauma associated withinvasive tracheal intubation.

There are two basic forms of nasal interface tubes; non-sealing nasalinterface tubes for supplemental oxygen therapy and sealing nasalinterface tubes for PAP ventilation.

Recently special versions of sealing nasal interface tubes have beendeveloped which are intended to improve PAP ventilation; however asshall be explained, these designs have significant deficienciesespecially when used in OSA applications.

Agdanowski, U.S. Pat. No. 4,648,398 describes an expandable foam-tippednasal prong wherein the user compresses the foam for insertion into thenostril then the foam re-expands to contact the nostril wall. The nasalprongs are right angle extensions from a base tube like oxygen therapyinterface tubes. The Agdanowski device has two significant deficienciesespecially when used in an OSA application: (1) The traditional basetube—right angle prong configuration is inherently resistant to flowbecause air which is forced into the base tube from both sides collidesin the middle of the base tube and the air must make an abruptdirectional change into the prongs. Generally, a resistant, turbulentdesign in an OSA application is undesirable because it causes extranoise (which is irritable to the user and bed partner) and because theuser must compensate by increasing the pressure setting (which is lesscomfortable to the user). Increasing the pressure setting is moredemanding on the seals, requiring the device to fit tighter to theuser's nose (also less comfortable to the user). In non-OSA applicationsa resistive, turbulent design is acceptable since noise or higherpressure is of no concern to the user. (2) The Agdanowski device alsodoes not allow the nasal prong portion to align correctly with theuser's nostril canal.

However, alignment is key in OSA applications because unaligned prongsare uncomfortable. For example, Winthrop, U.S. Pat. No. 5,682,881describes an interface tubes with an adhesive-backed foam strip placedon the skin below the nose for securing the interface tubes system inplace. While adhesive backed securement systems are common is variousshort-term therapy applications, their viability in long term orrepeated use is questionable. The Winthrop device also has the airflowresistance and alignment problems previously noted.

Trimble, U.S. Pat. No. 4,782,832 describes a nasal interface with a hardmanifold positioned under the nose from which two frustoconicalcorrugated members extend for insertion into and sealing against thenostrils. The manifold is suspended below the nose by a bracketextending down from the forehead between the eyes and down the bridge ofthe nose. A gas supply tube is attached to the bracket. This bracket andmanifold arrangement is an improvement for users who want the tubingaway from their mouth or ears, however this configuration is obtrusiveand not conducive to vision especially if wearing glasses. Additionally,discomfort from the hard plastic brackets and manifolds are common.Similar designs are described in Bordewick, et al., U.S. Pat. No.6,418,928, and Bordewick U.S. Pat. No. 6,431,172. This family of devicesis known commercially as the ADAM (airway delivery and management)Circuit or Nasal Pillows.

Wood, U.S. Pat. No. 6,478,026 describes a PAP nasal interface tubescomprised of a conventional oxygen interface tubes tubing configuration(a horizontal base tube positioned under the nose from which two prongsextend upward at right angles for insertion into the nostrils). Theprongs comprise oval cross sections and a concentric ring at their tips.Similar designs are described in Wood, U.S. Pat. No. 6,595,215, Wood,U.S. Patent Application No. 2002/0092527, Strickland U.S. PatentApplication No. 2003/0079749, and Wood, U.S. Patent Application No.2003/0116163.

Interface tubes prongs with oval cross sections have been in commercialuse since at least 1987, for example in Trimble, U.S. Pat. No.4,782,832, however, an oval cross section has no practical value for PAPusage. The prong material must be significantly more compliant than thenostril tissue for the requisite comfort, and hence the nostrilstructure will shape the prong to conform to the nostril regardless ofthe shape of the prong. Indeed, in pediatric and adult applications, aprong with a circular cross section is as comfortable and seals as wellas does an oval cross section prong, assuming they are both fabricatedusing the correct material softness.

Additionally, some of the devices have the problems of requiring deepinterface cannulation of the prongs into the nose for sealing andretention; deep interface cannulation is highly undesirable to manyusers and may cause mucosal irritation or erosion. Finally, this familyof inventions still possesses the nostril-prong alignment problems, flowturbulence problems, obtrusiveness, ear and cheek discomfort, anddiscomfort while user is lying on their side.

MacRae, U.S. Patent Application No. 2002/0046751 describes a medicineinhaler that has a waist-shaped tip that seals with the nostril. DeVoss, U.S. Patent Application No. 2002/00446755 describes an oxygennasal interface tubes with left and right nostril prongs that pinch thenasal septum in order to retain the device in place. Pinching isaccomplished by tilting the distal tips toward each other and the tiltand spacing can be adjusted in order to produce enough pinching force toachieve retention. This design is unacceptable in many PAP applications,because a pinch force of greater than about 2 lbs. compression isrequired for adequate pinching in adults, which cannot be tolerated forextended durations. A slight amount of repeated or long term pinchingcan be tolerated (<1 lbs.), however this is insufficient for retainingan interface tubes in place.

Light nostril septum pinching by PAP nasal interface tubes has beenpreviously successfully employed in the art described in Trimble U.S.Pat. No. 4,782,832 and Wood U.S. Pat. No. 6,478,026, however in thesecases other primary retention features are used to secure the apparatusin place and septum pinching is a secondary retention feature and likelyless than 1 lbs. compression.

Curti, U.S. Patent Application Serial No. 2002/0053346 describes anon-sealing oxygen nasal interface tubes with exhalation CO₂ sampling.The base tube between the nasal prongs is divided to create two separatetubing paths, one for oxygen delivery (inhalation) and one for CO₂sampling (exhalation). This device has utility in anesthesia situationswhere CO₂ monitoring is necessary and its teachings and embodiments areconsiderably different than that which is required for PAP applications.

In summary there are five significant requirements of a PAP nasalinterface tubes interface that are not adequately addressed in patientinterface devices especially for OSA applications: (1) low resistanceflow dynamics; (2) a comfortable and effective nostril seal withoutrequiring deep penetration into the nose; (3) a simultaneouslycomfortable, unobtrusive and non-irritating system to retain the deviceto the nose, face and head; (4) a system or device that is easy toattach and remove; and (5) the overall apparatus must be minimallyobtrusive, comfortable and ergonomic, allowing a user to speak, see,wear glasses, drink, and talk on the phone while being worn beforefalling asleep, and allowing the user to comfortably lay on their sideduring sleep without shifting the device or dislodging the portion thatseals to the nose. Most of the prior art is useful and applicable onlyfor PAP applications in which the patient is unconscious or heavilysedated thus unaware of the noted deficiencies.

As will be described in the subsequent sections, the presentinvention(s) disclosed herein solves the various deficiencies that existwith the currently available PAP nasal interface tubes devices,especially with respect to the requirements of an OSA user.

SUMMARY OF THE INVENTION

Disclosed in this invention is a unique PAP nasal interface tubesventilation interface comprising: (1) nasal prongs that are arcuatelycurved and non-angulated to minimize flow resistance, turbulence andnoise; (2) freely moveable prong alignment and spacing to permit optimalalignment of the prongs with the nostril foramen to optimize comfort tothe user; (3) a nostril sealing cushion engageable with the nostril rimto effect sealing without deep interface cannulation; (4) a strapsecurement system that that provides (a) an upward compression force forthe sealing cushions to stay engaged on the nostrils, and (b) thatprovides minimally obtrusive and maximally comfortable retention of theapparatus to the nose, face and head. Additional novel and uniquefeatures are also disclosed such as improved exhaust vent ports, mouthclosure, concurrent supplemental oxygen delivery and aromatherapy.

In one aspect of the invention, a nasal ventilation interface includinga pair of tubes configured to deliver a ventilation gas, the tubesattachable at a first end to a ventilation gas supply hose andengageable at a second end with a person's nostril; and a couplerconfigured to align the pair of tubes with the person's nostrils,wherein each tube has an absence of pneumatic interconnection with theother tube.

In another aspect of the invention, a kit comprising a pair of tubesconfigured to deliver a ventilation gas, the pair of tubes attachable ata first end to a ventilation gas supply hose and engageable at a secondend with a person's nostril; a coupler configured to align the pair oftubes with the person's nostrils, wherein each tube has an absence ofpneumatic interconnection with the other tube; and at least one pair ofsealing cushions configured to be attachable to the second end of eachventilation interface tube and configured to impinge the nostril.

In a further aspect of the invention, an apparatus for supplyingventilation gas, the apparatus includes a connector configured to beattachable to a ventilation gas supply; a pair of tubes extending fromthe connector and configured to impinge a rim of a user's nostril suchthat a pressurized gas from the ventilation gas supply can be suppliedto the person's respiratory system; and a coupler configured to alignthe pair of tubes with the person's nostrils, wherein each tube has anabsence of pneumatic interconnection with the other tube.

In another aspect of the invention, a method of receiving a pressurizedgas comprising positioning a ventilation interface device on a patient,the ventilation interface device comprising a pair of tubes configuredto deliver a ventilation gas, the pair of tubes attachable at a firstend to a ventilation gas supply hose and engageable at a second end witha person's nostril; a coupler configured to align the pair of tubes withthe person's nostrils, wherein each tube has an absence of pneumaticinterconnection with the other tube; and securing the ventilationinterface with a first strap extending laterally over the ears fromunderneath the nose such that the first strap provides upward lift.

In one aspect of the invention, a nasal ventilation interface comprisinga distal end configured to engage a user's nostrils; a proximal endconfigured to attach to a ventilation gas supply; and a mid-sectionbetween the proximal and distal ends, wherein the distal end and themid-section comprises a pair of tubes having an arcuate non-angulatedshape and having an absence of pneumatic interconnections between eachof the tubes of the pair.

In a further aspect of the invention, a nasal ventilation interfacecomprising a pair of tubes configured to engage a user's nostrils at adistal end, wherein the distal end of the tubes comprise a substantiallystraight centerline axis, and further comprising a proximal endconfigured to attach to a ventilation gas supply hose; and a couplerconfigured to connect the pair of tubes having a movable joint betweenthe pair of tubes, wherein the movable joint comprises a swivel topermit rotational movement of the tubes in at least one plane, whereinthe movement is used to substantially align the axial centerline of eachtube with a nostril foramen.

In another aspect of the invention, a nasal ventilation interface forthe purpose of supplying ventilation gas to a person's airway, theinterface comprising a generally tubular construction with a distal endconfigured with a first and a second tube for engagement with a person'snostrils, a proximal end configured for attachment to a ventilation gassupply hose, and a coupler connecting the first and second distal endsof the tubes, and further comprising a lifting means appliedsubstantially directly under the nose to the distal end of the first andsecond tubes, wherein the lift creates and maintains an engagement forcebetween the tubes' distal tip and the nostrils, and further wherein thelifting means comprises a first strap attached to the head over andbehind the ears.

In a further aspect of the invention, a nasal ventilation interfaceapparatus for the purpose of supplying ventilation gas to a person'sairway, the apparatus comprising a generally tubular construction with adistal end comprising a first and second tube configured to engage aperson's nostrils, a proximal end configured to attach to a ventilationgas supply hose, wherein the distal end comprises a facial padpositioned between the tubes and the skin between the user's nose andupper lip, wherein the facial pad cushions the user's skin and tilts thedistal end tubes in an angle in the sagittal plane wherein the anglealigns the distal end tubes with the rim of the user's nostril.

In another aspect of the invention, a nasal ventilation interfaceapparatus for the purpose of supplying ventilation gas to a person'sairway comprising a generally tubular construction with a distal endcomprising a first and a second tube configured to engage a person'snostrils, a proximal end configured to attach to a ventilation gassupply hose, further comprising a band member substantiallycircumventing the head from the chin to the top of the head, wherein theband applies upward compression on the chin so as to bias the mouth in aclose state, and wherein the band comprises means to attach theapparatus to the band member.

The above aspects of this invention are more fully explained inreference to the drawings and general disclosure herein.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will now be described in greater detail with reference tothe preferred embodiments illustrated in the accompanying drawings, inwhich like elements bear like reference numerals, and wherein:

FIG. 1 shows a front view of a conventional nasal interface cannula forpositive pressure ventilation.

FIG. 2 shows a perspective of the conventional nasal interface cannulaof FIG. 1.

FIG. 3A shows a front view of a nasal interface according to oneembodiment of the present invention.

FIG. 3B shows a front view of the nasal interface of FIG. 3A accordingto another embodiment.

FIG. 4 shows an exploded perspective view of the nasal interface of FIG.3A.

FIG. 5A shows a cross-sectional view of the nasal interface of FIG. 4along the line A-A.

FIG. 5B shows a cross-sectional view of the nasal interface of FIG. 4along the line B-B.

FIG. 6 shows a perspective view of a coupler according to one embodimentof the present invention.

FIG. 7 shows a perspective view of various couplers as shown in

FIG. 6.

FIGS. 8A-8G show perspective views of the coupler according to FIG. 6having various method of adjusting the length of the coupler accordingto various aspects of the present invention.

FIG. 9 shows a perspective view of an alternative embodiment of thecoupler, wherein the coupler has a lumen that communicates pneumaticallywith the tubes of the interface device.

FIG. 10 shows a cross-sectional view of the coupler of FIG. 9 along theline C-C.

FIG. 11A shows a plan view of various angle of adjustment of theinterface tubes configured to align the tubes with the nostrils of thenose.

FIG. 11B shows a side view of the various angles of adjustment of theinterface tubes of FIG. 11A.

FIG. 12 shows a perspective view of the connection between the couplerand interface tubes.

FIGS. 13A-13H show cross-sectional views of various connections betweenthe coupler and interface tubes of FIG. 12.

FIG. 14A shows a front view of a sealing cushion configured to sealagainst a rim of the nostril, including a stepped cushion profile forengagement and sealing to the nostril rim.

FIG. 14B shows a perspective view of the sealing cushion of FIG. 14A.

FIG. 14C shows a cross-sectional view of the sealing cushion of FIG. 14Aalong the line D-D.

FIG. 14D shows a perspective view of a sealing cushion.

FIG. 14E shows a cross-sectional view of the sealing cushion.

FIGS. 15A-15G show cross-sectional views of various sealing cushionsaccording to a further embodiment of the present invention.

FIGS. 16A-16E show a cross-sectional view of the various sealingcushions along line E-E of FIG. 14D.

FIG. 17 shows a front view of another aspect of the sealing cushion.

FIGS. 18A-C show a cross-sectional view of another aspect of the sealingcushion, wherein the sealing cushions are inflatable, application of avacuum, and where the sealing cushion is part of the interface tubes,respectively.

FIG. 18D shows a perspective view of a further aspect of the sealingcushions, wherein the sealing cushions are comprises of at least onering.

FIG. 18E shows a top view of a sealing cushion of FIG. 18D.

FIGS. 19A and 19B show a front and side view of a head strap configuredto lift and compress the sealing cushions against the nose and securesthe position of the interface tubes lateral to the nose.

FIGS. 20A and 20B show front views of the head strap of FIGS. 19A and19B.

FIGS. 21A and 21B show a front and side view of exhaust vent portsangulated to be co-linear with the natural directional vector of exhaledgas.

FIG. 22 shows a cross-sectional view of the exhaust vent ports of FIGS.21A and 21B.

FIGS. 23A and 23B show a front and side view of a mandibular liftheadband.

FIG. 24 shows a plan view of a nasal interface kit.

FIG. 25 shows a perspective view of a nasal mask for use with aventilation system.

FIGS. 26A-26I show cross-sectional views of a nasal spacer positionedwith the nasal mask of FIG. 25.

FIG. 27A shows a front view of a hybrid ventilation interface devicecomprising a nasal mask and a pair of interface tubes.

FIG. 27B shows a cross-sectional view of the of the hybrid ventilationinterface device of FIG. 27A.

FIG. 28A shows a front view of another embodiment of a hybridventilation interface device.

FIG. 28B shows a cross-sectional view of FIG. 28A.

FIG. 29A shows a front view of a further embodiment of a hybridventilation interface device.

FIG. 29B shows a cross-sectional view of FIG. 29A.

FIG. 30 shows a front view of a portable breathing gas pressuregenerating and delivery unit.

FIG. 31 shows a top view of the portable breathing gas pressuregenerating and delivery unit of FIG. 30.

FIG. 32 shows a front view of an alternative embodiment of the nasalinterface device.

FIG. 33A show a front view of a further embodiment of the nasalinterface device of FIG. 32.

FIG. 33B shows a front view of another embodiment of the nasal interfacedevice of FIG. 32.

FIG. 34 shows a cross sectional view of a strap of FIG. 32 along lineF-F.

FIG. 35 shows a side view of the nasal device of FIG. 32 showing how thedevice hugs the face for comfort.

FIG. 36A shows a front view of a mouth guard according to one embodimentof the present invention.

FIG. 36B shows a cross-sectional view of the mouth guard of FIG. 36Aalong the line F-F.

FIG. 37 shows a perspective view of an aromatherapy delivery technique.

DESCRIPTION OF THE INVENTION

Nasal Interface

FIGS. 1 and 2 show a perspective view of a conventional positive airwaypressure (PAP) nasal interface 10. The nasal interface 10 comprises abase manifold 20 positioned below the nose from which two nasal prongs22 extend at right angles 24 upward into the nose. The base manifold 20typically receives airflow 26 from both directions causing turbulentmixing and high resistance 28. The sudden directional change of theairflow up into the two nasal prongs 22 adds to the high resistance andturbulent flow 28 within the manifold 20.

FIG. 3A shows a perspective view of a nasal interface device 30according to one embodiment of the present invention. The device 30comprises a pair of ventilation interface tubes 32 which are configuredto deliver a ventilation gas to a user. The tubes 32 are attachable at afirst end 34 to a ventilation gas supply hose 64 and engageable with aperson's nostrils at a second end 36. Each tube 32 has an absence ofpneumatic interconnection with the other tube 32 providing laminar flowto the nostrils.

As shown in FIG. 3A, the ventilation gas supply hose 64 is attachable tothe pair of tubes 32 with a bifurcation device 61. The bifurcationdevice 61 is preferably a Y-connector 48. However, it can be appreciatedthat other shapes and configurations can be used to bifurcate the gassupply hose into at least two tubes 32. The bifurcation device 61 alsopreferably comprises at least one swivel 62. As shown in FIG. 3A, thebifurcation device 61 can further include at least two swivels 62, ahose coupler 60 and the Y-connector 48.

The pair of tubes 32 preferably impinge the rim of the nostrils at thesecond end 36. As shown in FIG. 3A, the device 30 can be secured to theuser by a combination of a first strap 74 in the form of a headband anda second strap 78 in the form of a neckband. The first strap 74preferably attaches to the pair of tubes 32 just below the user'snostril by a suitable means. The first strap 74 preferably extends fromjust below the user's nostril and over the user's ears connecting behindthe back of the user's head. It can be appreciated that the interfacedevice 30 can be secured to the user's face by any suitable means.

In an alternative embodiment, a second strap 78 can be used to attachthe interface device 30 to the neck area of the user. As shown, thesecond strap 78 is attachable to each of the tubes 32 at a locationbetween the bifurcation device 61 and the second end of the device 36.The second strap 78 can preferably be attachable to the interface tubes32 by any suitable means including a snap lock, Velcro, fabric loop,clip, and other suitable attachment devices.

FIG. 3B shows a perspective view of another embodiment of the nasalinterface device as shown in FIG. 3A. As shown in FIG. 3B, theventilation gas supply hose 64 is attachable to the pair of tubes 32.The pair of tubes 32 extend directly from the bifurcation device 61 tothe nostrils without an arcuate shape as shown in FIG. 3A.

The hose coupler 60 is configured to direct the gas supply hose 64 awayfrom the body. The hose coupler 60 is preferably an angled member havingan angle of approximately 90 degrees to approximately 180 degrees. Asshown in FIG. 3A, the hose coupler 60 is a 90 degree angle. Meanwhile,the hose coupler 60 as shown in FIG. 3B has an angle of approximately120 degrees.

FIG. 4 shows an exploded perspective view of a nasal interface device 30according to another embodiment of the present invention. As shown inFIG. 4, the device 30 is generally comprised of a tubular construction,and can be comprised of three basic sections; a distal section 40, amid-section 42 and a proximal section 44.

The distal section 40 comprises a pair of sealing members 46, a pair ofdelivery tubes 37, and a connector 33. As shown in FIG. 4, the pair oftubes 32 as shown in FIG. 3 can be separated into a pair of supply tubes35 positioned within the midsection 42 of the device 10 and a pair ofdelivery tubes 37 positioned within the distal section 40 of the device30. Alternatively, the pair of tubes 32 can be, as shown in FIGS. 3A and3B, one continuous tube extending from the gas supply hose 64 to thedistal end 36.

The pair of delivery tubes 37 can be configured to engage the rim of theuser's nostril or nares or alternatively a pair of sealing members 46can be attached to the distal end 36 of the delivery tubes 37. As shown,the supply tube 35 is preferably attachable to the ventilation gassupply hose 64 via a Y-connector 48 at one end and to the pair ofdelivery tubes 37 at the other end with the connector 33.

In a preferred embodiment of the present invention, the pair ofinterface tubes 32 comprising the pair of delivery tubes 37 and the pairof supply tubes 35 are unconnected pneumatically to each other. However,the pair of tubes 32 can be mechanically connected via a mechanicalcoupler 66. In addition, the interface tubes 32 are preferably void ofabrupt angles from the proximal end to their distal end of each of thetubes 32. As shown in FIG. 4, the distal end of each of the interfacetubes 32 preferably comprise a terminal section 100, which is axiallysubstantially straight (but not necessarily absolutely straight) forengagement with or for minor insertion into the nostrils.

At the inferior base of these distal straight terminal sections 100 theinterface tubes 32 assume the most gradual curvatures 104 and 106 aspossible while still fitting within the anatomy. The interface tubes 32may curve and extend away from the nostrils in several possibleconfigurations. In the preferred configuration the interface tubes 32curve first laterally 106 then inferiorly 104 toward the ventral aspectof the neck, typically lateral to the corners of the mouth. It can beappreciated that the tubes 32 are curve posteriorly. This curvednon-angulated configuration minimizes flow resistance thus minimizingturbulence, leakage, noise and the required pressure level. Airflowresistance of this invention is approximately 25% less than that ofconventional PAP nasal cannulae (which is more resistive for the reasonsdescribed previously).

In a further embodiment of the present invention as shown in FIG. 4, thedistal section 40 of the device 30 is preferably equipped with a pair ofsealing cushions 46 that impinge the nostrils. The sealing cushions 46are attachable to a distal end of each of the pair of tubes 32. Thesealing cushions 46 position the interface tubes 32 against the nostrilrim to provide a leak free connection between the sealing cushion 46 andthe interface tubes 32, and to prevent dislodgment of the sealingcushions during use. As shown in FIGS. 14, 15 and 16, the sealingcushions 46 can be configured in any suitable shape and cross-sectionaldesign to insure proper sealing and comfort. The shape of the sealingcushions 46 including the cross-sectional design also provides comfortto the user.

The distal section 40 is preferably secured to the user by the firststrap 74 or headband. As shown in FIGS. 3A and 3B, the first strap 74preferably attaches to the pair of tubes 32 just below the user'snostril by a suitable means. As shown in FIG. 4, the first strap 74 isattachable to the interface tubes 32 via a connector 76. The first strap74 preferably extends from just below the user's nostril and over theuser's ears connecting behind the back of the user's head. It can beappreciated that the interface device 30 can be secured to the user'sface by any suitable strap, band or retention device.

The connector 76 is preferably attached to the coupler 66 to secure thedevice 30 to the nose, face and head. An additional strap or secondstrap 78 can be provided for attachment of the interface tubing 32 inthe mid-section 42 to the neck to help secure the device to the body. Itcan be appreciated that in an alternative embodiment, the mid-section 42disconnects from at least the distal section 40, allowing separation ofthe interface tubing 32, as needed.

As shown in FIG. 4, the distal section 40 comprises a pair of sealingcushions 46, a mechanical coupler 66 and the second or distal ends ofthe pair of tubes 32. In a preferred embodiment of the presentinvention, the pair of interface tubes 32 is joined under the nose withthe mechanical coupler 66. The coupler 66 is configured to adjust thespacing 120 (FIG. 6) of the pair of distal tips to match the user'sanatomy.

It can be appreciated that in a preferred embodiment, immediatelyproximal to the soft sealing cushions 46, the pair of tubes 32 isattached with a coupler 66. A skin cushion or facial pad 68 can beattached to the coupler 66 or to one of the neighboring interface tubes32 for the purpose of padding the skin to absorb strapping forces andaligning the angle of the distal tips of the device with the user'snostrils.

The mid-section 42 comprises symmetrical tubes of either the interfacetubes 32 or as shown in FIG. 4 the supply tubes 37. If a second strap 78is provided the supply tubes 37 are attached to the second strap 78 viaa loop connector 79. It can be appreciated that the second strap 78 canbe attached by any suitable connector to the interface tubes 32.

As shown in FIG. 4, at the proximal end 44, the pair of tubes 32 joinsat a bifurcation site 48. The bifurcation site 48 is preferablysubstantially proximal to the distal end 36. However, it can beappreciated that the bifurcation site 48 does not have to besubstantially proximal to the distal end 36 and can be positioned moredistal to the distal end 36 of the device 30. Between the distal tip andthe bifurcation site 48, the device 30 is comprised of generallysymmetric construction. Preferably, the pair of tubes 32 is not incommunication pneumatically other than at the site of bifurcation 48.

The nasal interface device 30 is preferably made of biocompatible,hypoallergenic materials or other suitable materials. In addition, thedevice 30 can be treated with antimicrobial, hydrophilic or lubricioussurface treatments to prevent unfavorable tissue response.

The interface tubes 32 including the supply tubes 35 and delivery tubes37 are preferably made of material such as polyvinyl chloride (PVC),plastisol, silicone, urethane, urethane-PVC blends, synthetic thermosetsor combinations thereof. It can be appreciated that the device 30 can bemade from any suitable material.

The interface tubes 32 preferably have an inner diameter of about 8 mmto about 16 mm for adults, about 5 mm to about 8 mm for pediatrics, andabout 1 to about 5 mm for neonates. In addition, the interface tubes 32preferably have a durometer of about 30 A Shore to about 80 A Shore forthe tubes 32 and a durometer of about 10 A to about 70 A for the distalend 36 and/or sealing cushions 46.

FIGS. 5A and 5B show a preferred embodiment of a cross-sectional view ofthe pair of interface tubes 32 in the distal section 40 and themid-section 42 of the device 30, respectively. As shown in FIG. 5A, thecross-sectional shape of the tubing 32 at the mid-section 42 is round110. However, it can be appreciated that the cross-sectional shape ofthe distal section 40 or mid-section 42 of the interface tube 32 caninclude longitudinal or radial ribs 112 to prevent kinking. As shown inFIG. 5B, the interface tubes 32 in the distal section 40 preferably havea flatter profile 114 so as to be less obtrusive to the user, or cancomprise radial corrugations in strategic locations to provide flexureof the device 30 to mate with the individual's anatomy. Alternatively,the device 30 can comprise shape-memory or malleable shape-able memberswithin its construction to allow the pair of interface tubes 32 to becurved optimally to fit the individual's anatomy.

Preferably, the distal section 40 of the nasal interface device 30 isinjection molded to its final shape. However, the distal section 40 canbe extruded or injection molded straight then bend-formed to its finalshape, or dip formed, or can be shapeable by the user. The proximalsection of the device 30 is preferably extruded and optionallybend-formed into the desired curved shape that matches a stereotypicalchin and neck anatomy. It can be appreciated that the combination ofinjection molding, extruding or injection molded straight and thenbend-formed into the desired shape can be used to manufacture theinterface device 30.

FIG. 6 shows a perspective view of a portion of the distal section 40 ofthe device 30. As shown in FIG. 6, the distal section 40 comprises apair of sealing cushions 46 and the second or distal ends of the pair ofinterface tubes 32. In a preferred embodiment of the present invention,the pair of interface tubes 32 is joined under the nose with amechanical coupler 66. The coupler 66 is configured to adjust thespacing 120 of the pair of distal tips or sealing cushions 46 to matchthe user's anatomy.

The coupler 66 is preferably a plastic tubular member of approximately60-80 Shore A durometer. The coupler 66 is preferably extruded and thenformed to create the joints, or alternatively injection molded.

As shown in FIG. 7, the coupler 66 can be removably attached to theinterface tubes 32 in which case there may be a variety of sizes 140 orshapes 142. The variety of sizes 140 or shapes 142 can be select basedon the user's anatomy.

Alternatively, as shown in FIGS. 8A-8G, the coupler 66 can bepermanently affixed to the pair of interface tubes 32, in which case thecoupler 66 preferably comprises an adjustment feature to adjust orchange the length of the coupler 66. The length of the coupler 66 can beadjusted by the use of opposing hooks 122 (FIG. 8A), a ratchet 124 (FIG.8B), a threaded system 126 (FIG. 8C), a tongue and flat groove 128 (FIG.8D), an opposing saw tooth 130 (FIG. 8E), opposing connectable tubes 132(FIG. 8F), or a ball and socket 134 (FIG. 8G). It can be appreciatedthat the length of the coupler 66 can be adjusted using any suitabledevice.

In an alternative embodiment as shown in FIGS. 9 and 10, the coupler 66can further comprise a lumen 144 that communicates pneumatically withthe pair of interface tubes 32. The lumen 144 is preferablysubstantially smaller and more resistive to airflow than the interfacetubes' main lumen so as to limit airflow into the coupler to avoidgenerating backpressure into the interface tubes 32 lumens. However, itcan be appreciated that the lumen 144 can be substantially smaller,smaller, equal or substantially larger than the interface tubes 32 mainlumen. In addition, it can be appreciated that the coupler lumen 144 caninclude exhaust vent ports 146 allowing venting of an exhaled gas 148and CO₂ out of the coupler 66.

FIGS. 11A and 11B show a front and side view of the interface device 30based on a user's facial anatomy. As shown in FIGS. 11A and 11B, thesecond or distal ends 36 of the interface tubes 32 can swivel inmultiple planes from a roughly fixed origin 164 in order to align thecenterline axis of the distal tips 160 with the centerline axis of thenostril canals 162. Because there is a vast variety of nose shapes,sizes, and angles, and because proper alignment is essential forcomfort, angle adjustability in multiple planes is essential especiallyin OSA applications. In order to achieve a proper alignment, theinterface tubes 32 can swivel in the sagittal plane S, the coronal planeC and the transverse plane T.

As shown in FIGS. 11A and 11B, the sagittal plane S generally relates tothe suture between the parietal bones of the skull or situated in orbeing in the medial plane of the body or any plane parallel thereto. Thecoronal plane C relates to lying in the direction of the coronal sutureor relating to the frontal plane that passes through the long axis ofthe body. Meanwhile, the transverse plane T is at right angles to theanterior-posterior axis of the body.

FIG. 12 shows a perspective view of another aspect of the presentinvention further comprising a movable joint 67 between the coupler 66and the distal end of the interface tubes 32. The movable joint 67allows free movement of the distal end of the interface tubes 32 inorder to permit alignment of the sealing members 46 and the rim orentrance of the nostril canals.

As shown in FIGS. 13A-13H, the movable joint 67 can be a hinge joint 180(FIG. 13A), a ball and socket swivel joint 182 with the ball attached tothe interface tubes 32 (FIG. 13B), a ball and socket swivel joint 190with the ball attached to the coupler 66 (FIG. 13C), a gliding joint 194with a coupler ball inserted into the interface tubes lumen (FIG. 13D),a combination of a ball and socket swivel joint with a glide joint 192(FIG. 13E), a pivot joint 196 optionally with an inserted tie bar (FIG.13F), a gliding joint with a catch feature inserted into the interfacetubes lumen 188 (FIG. 13H), a flex joint 194 (FIG. 13G), or anycombinations thereof. It can be appreciated that the movable joint 67can be any suitable joint and that the embodiments as provided areexamples only.

The joints between the interface tubes 32 and the coupler 66 can beinsert molded, bonded or press fit into the respective components.

FIG. 14A shows a front view of the distal tips 100 of the interfacetubes 32, which are equipped with sealing cushions 46. As shown in FIG.14A, the sealing cushions 46 and seal the nostril. In addition, thesealing cushions 46 prevent the interface tubes 32 from penetrating deepinto the nostril. The sealing cushions 46 are preferably removablyattachable from the interface tubes 100.

As shown in FIG. 14A, the sealing cushions 46 and the interface tubes 32are designed to assure (1) proper positioning of the sealing cushion 46against the nostril rim, (2) a leak free connection between the sealingcushion 46 and the interface tubes 32, and (3) prevent inadvertentdislodgement of the sealing cushion 46 during use.

FIG. 14B shows a perspective view of a sealing cushion 46 and distal end100 of the interface tubes 32, comprising a step 202, a ridge 204, agroove 206, and a button or hook 208. The sealing cushion 46 can includea leash 210 (FIG. 14D) for grasping so that the sealing cushion 46 iseasily installed and removed.

As shown in FIG. 14E, the sealing cushion 46 preferably extends 220beyond the terminal section 100 of the interface tubes 32, such that thesealing cushion 46 enters the nostril rather than the terminal section100 of the interface tube 32. It can be appreciated that the sealingcushions 46 can have any suitable cross sectional shape that provides aseal against the nostril of the noses. Thus, any variety of crosssectional shapes can be implemented and that the cross sectional shapesshown are only a few of the cross sectional shapes.

The sealing cushions 46 are preferably comprised of a soft thermoset orthermoplastic material of 45-60 Shore OO durometer. In addition, thesealing cushions 46 are preferably translucent or tinted to make itaesthetically pleasing or color coded, wherein each color is associatedwith a size and/or cross-sectional shape. The seal cushions 46 can beformed by extruding then shape forming, or by dip-molding or injectionmolding.

As shown in FIG. 14E, the terminal section 100 of the interface tubes 32comprise an interface tube tip 222 position on the distal end of theinterface tubes 32. The interface tube tip 222 is preferably of thinnerwall thickness 224 than the thickness 226 of the balance of theinterface tubes 32 to decrease the rigidity of the terminal section 100in the event the tip is felt by the nostril.

FIG. 14C shows a stepped profile of a sealing cushion 46 with a firstdiameter 230 at the distal tip 235 and a second diameter 232 larger thanthe first diameter 230 at distance 234 from the distal tip 235. Thelarger diameter 232 is sized to be larger than a diameter of a nostrilopening 236 and the smaller tip diameter 230 is designed to beapproximately equal to or slightly less than the inner diameter of thenostril opening 236. Thus, the configuration seals on the outside rim238 of the nostril and optionally seals along a depth on the insidesurface 240 of the nostril. As shown, the engagement depth 234 is keptrelatively shallow, preferably at a depth equal to about 5% to about 70%of the nostril diameter, and more preferably at a depth equal to about20% to about 30% of the nostril diameter. However, it can be appreciatedthat the penetration can be greater or less than the diameters set forthabove.

In addition, as shown in FIGS. 15A-15G, shape of the sealing cushion 46is not limited to the configuration as shown in FIGS. 14A-14E. Forexample, the sealing cushions 46 can comprises a convex profile thatcurves inward 250 whereupon the nostril rim engages 252 on the curvedinward surface (FIG. 15A), or a flared shaped sealing cushion 254 whichat the distal tip flares to a larger diameter 256 than the base of theflare 258 such that the flared diameter seals on the inside diameter ofthe nostril at a distance in from the nostril rim (FIG. 15B), a doubleseal 260 (FIG. 15C), a mushroom profile 262 (FIG. 15D), a waist profile264 (FIG. 15E), a reverse barb profile 272 (FIG. 15F), or a profilesealing around the outside of the nose 278 (15G).

Alternatively, the cross sectional profiles of the sealing cushions 46can vary to match the anatomy depending on individuality variances. Forexample, the cross sectional profile of the sealing cushion can becircular 280 (FIG. 16A), an oval 282 (FIG. 16B), an arcuate 284 (FIG.16C), an L-shaped 286 (FIG. 16D), an elliptical 288 cross sectionalshape (FIG. 16E), or alternatively the cross sectional shape throughoutthe length of the cushion may vary. It can be appreciated that selectionof different sizes and shapes can be available to optimize fit andcomfort, as well as adjustability of the design, and the cushions may beshape-able by the user to match the desired shape.

FIG. 17 shows a front view of another aspect of the sealing cushion 46,wherein the sealing cushions are inflatable (FIG. 18A), an applicationof a vacuum to the sealing cushion 46 is use (FIG. 18B), and where thesealing cushion 46 is part of the interface tubes 32 (FIG. 18C).

FIG. 18A shows a cross-sectional view of the sealing cushion 46, asshown in FIG. 17 in the area of nostril (X) that partially dilates orinflates 300 to seal against the nostril wall. Inflation can beperformed by an inflation channel 302 communicating with the cushion, orby pressurization from the inside of the interface tube lumen 304 intothe cushion space 306.

FIG. 18B shows a cross-sectional view of an alternative embodimentwherein the seal between the interface tube tip (or cushion) 320 andnostril wall is enhanced by application of a vacuum to the space betweenthe interface tube and the nostril wall, either on the inside of thenostril or at the outside rim of the nostril 310 where continuoussuction will not irritate the skin. Vacuum is delivered to the sitethrough channels 322 in the interface tubing or through a separatevacuum tube 324. When applied, the vacuum sucks the nostril wall tissueinto contact with the sealing cushion to create the seal.

FIG. 18C shows a cross-sectional view of a further embodiment in whichthe sealing cushion 46 is permanently connected to the nasal interfacetubing 32, which may be more economically viable in single-usedisposable applications such as emergency use. This one-piece design canbe constructed by two pieces bonded or welded together or by a unitarydesign where the interface tubing material is thinned and reshaped 328at the very tip to create the necessary softness and sealing shape.

FIG. 18D shows a perspective view of another embodiment of the sealingcushions 46, which are configured to fit within the nostril. As shown inFIG. 18D, the sealing cushion 46 comprises at least one disk 340, whichis configured to fit within the nostril. The at least one disk 340retains the sealing cushion 46 and tube 32 within the nostril byapplying a minimum amount of pressure on the inside of the nostril. Inorder to spread out or distribute the force against the inside of thenostril, the sealing cushions 46 preferably comprises a plurality ofdisks 340. As shown in FIG. 18D, the sealing cushions 46 comprises twodisks 340 having a downward shape or mushroom appearance.

FIG. 18E shows a top view of the sealing cushion 46 of FIG. 18D. Asshown, the sealing cushion 46 comprises at least one disk 340 extendingaround the lumen 34 of the sealing cushion 46.

FIGS. 19A and 19B show a front view and a side view, respectively of afirst strap 74, which connects to the coupler 66 at a rotationalorientation at about 360 degrees opposite the nostril opening. The firststrap 74 extends bilaterally, preferably over the ears, and is joinedbehind the head. The attachment orientation and overall configurationthus produces an upward lift 342 on the distal tips 235 of the sealingcushions 46 against the nostrils, thus compressing and retaining thesealing cushions 46 against the nostrils to facilitate and maintain aseal. The first strap 74 presses the interface tubes 32, lateral to thenose, against the skin 344 to help prevent inadvertent shifting of theinterface tube 32 and the sealing distal tips.

The first strap 74 aides in retention of the device 30 to the user'sface. Preferably at least a portion of the first strap 74 comprises anelastomeric material, such as a translucent highly elastic thermoset orthermoplastic material to enhance comfort and to reduce intrusiveness.Meanwhile, the balance of the first strap 74 is comprised of a fabric,such as a woven rubber-nylon blend. Alternatively, it can be appreciatedin a further embodiment, the first strap 74 can further be comprised ofa material, which provides padding on the skin side of the first strap74, especially at the ear area or under the nose to further improvecomfort. The attachment 76 to the coupler 66 can be a half-pipe thatsnaps onto a tubular-shaped coupler, or a snap, or a spring type catch,a loop or other easy attachment means, or the first strap 74 and coupler66 can be permanently affixed together.

Alternatively, as shown in FIGS. 20A and 20B, the first strap 74 caninclude a slot 352 through which the distal ends of the interface tubes32 pass (FIG. 20A), or a quick connect connection 356 to the interfacetubes 32 (FIG. 20B), in order to provide additional lifting of theinterface tubes lateral to the nose 354 to facilitate and maintainpositive engagement with the nostril for sealing and overall apparatusretention. These attachment means may be floating attachments allowingsome degree of motion between the interface tubes and the strap or maybe non-floating. It can be appreciated that while certain specificaspects of the strap are disclosed, its uniqueness of lifting the distaltips against the nose for maintaining seal compression can be providedwith a variety of attachment sites, fastening designs, and strapmaterials. In addition, the construction of the first strap 74 caninclude a shape memory or a shapeable member 75 to facilitatepositioning and security of the device without sacrificing comfort.

FIG. 19B also shows a further embodiment of the present invention inwhich a nose or facial pad 68 is located under the nose to tilt theangle 362 of the distal end of the interface tubes 32, relative to theface, so as to align the angle 160 of the interface tubing distal tip235 with the angle of the nostril canals 162 in the Sagittal plane. Thepad 360 preferably comprises a soft, deformable material such as a jellor a shape memory energy absorptive material such as a viscoelasticfoam.

The pad 68 can be attachable to the coupler 66 and or to the pair ofinterface tubes 32 directly under the nose and the attachment locationis preferably keyed to assure proper orientation when connecting tocreate the upward lift 342 in the desired vector.

The nose or facial pad 68 is preferably formed of a malleable materialwith an adherent surface, which is placed over the nose and shaped intoa shape that prevents over-distention of the nostrils from the pressurebeing extended upward on the nostrils by the nasal interface.Alternatively, ear loops or a head strap can retain the pad 68.

Alternatively, a variety of pad sizes can be available to the user toselect the correct tilt setting, or the pad 68 itself can be adjustable.It can be appreciated that the pad 68 can be an integral part of thecoupler 66, the head strap connector 76, interface tubes or sealingcushions 46, or the pad 68 and head strap connector 76 can connect toeach other around or through the coupler 66. It can be appreciated thatthe pad can be attached to the head strap connector with a hinge suchthat the two snap together around the coupler.

FIGS. 21A and 21B show a front and side view, respectively of anotheraspect of the present invention comprising ventilation exhaust ventports 370. The exhaust vent ports 370 are generally used in a CPAP orVPAP patient interface applications since these systems do not includeexhalation valves. The vent ports 370 lower the CO₂ levels inside theinterface tubes 32 of the device 30, thus facilitate exhalation. Inaddition, the vent ports 370 provide a safety access to ambient air inthe case of a gas source supply interruption.

As shown in FIGS. 21A and 21B, the vent ports 370 are configured in adiagonal orientation 380 with respect to the user's face so as to createa flow direction 382 outward from the face and downward from the nose,thus simulating the natural direction of nasal exhaled flow anddirecting the flow away from the user's face and not in the direction ofthe bed partner. The vent ports 370 can be located in the interfacetubes 32 directly below the nose 384, or further proximally near thecheek 386.

In a preferred embodiment, as shown in FIG. 22, the vent ports 370 arefurther configured for proper flow dynamics and entry effects (e.g., achamfered or rounded leading edge 388) and there may be filtering fornoise abatement (e.g., a low flow resistance filter integrated into thevent ports). The wall in the interface tubes 32 can be thickened 392 inthe area to facilitate proper configuration and performance of thechannels. It can be appreciated that the device 30 can be devoid of thevent ports 370 when used for PAP applications in which there is anexhalation valve in the tubing circuit.

FIGS. 23A and 23B show a front and side view, respectively of a headband440. The headband is configured to secure the interface tubes 32 inplace while preventing the mandible 442 from opening in order to preventmouth leaks. The headband 440 positions the distal end 100 of theinterface tubes 32 to provide an upward lifting force 342 on theinterface tube distal tips 100 such that the tips are compressed againstthe nostril to maintain a seal. The headband 440 can be an adjustabledesign to meet a variety of anatomies, or can be available in a varietyof sizes. The headband is preferably comprised of an elastomeric ofstretchable foam type material such as neoprene.

In another embodiment, a conduit or tube can be integrated into theinterface tubes 32 of the device 30 for the purpose of supplyingsupplemental oxygen concurrent with the PAP therapy. Alternatively, theconduits or tube can be integrated into the interface tubes 32 of thedevice 30, which are connected to a vacuum source for the purpose ofscavenging CO₂ rich air within the tubes 32 of the device 30. A mouthshield can be used, which is interconnected to the device and placed inthe mouth for the purpose of blocking inadvertent leakage of the PAPair. It can be appreciated that a therapeutic or relaxing aromatic scentcan be injected into the ventilation gas supply, preferably be insertinga cartridge into a receptacle in-line with the device's ventilationsupply tubing.

It can be appreciated that the nasal interface device 30 as shown inFIGS. 1-23 can comprise any, some or all of the described embodiments.Also, while most of the embodiments described relate to long term orrepeated use of the device, such as with OSA, it can be appreciated thatthere are non-OSA ventilation uses that would also benefit from theseembodiments, such as PAP therapy for COPD, anesthesia recovery,mechanical ventilator weaning, outpatient surgery use, and emergencyventilation. Further, it should be appreciated that in addition to CPAPor VPAP ventilation, the invention can be used for other forms ofmechanical ventilation such as CMV, SIMV, etc. Finally it should beappreciated that with the necessary modifications, the device can bereusable or disposable and can be adapted for adult, pediatric orneonatal use.

FIG. 24 shows a nasal interface kit 400 comprising a pair of nostrilsealing cushions 46, a pair of interface tubes 32, a coupler 66, a firststrap 74, a spare coupler 66, skin pads 68, a second strap 78, acleaning and storage container 404, skin ointment 406, aroma therapycartridges 408, a sizing gage 410, instruction sheet 412, an interfacestorage bag 414, a chin/mouth closure head band 418, and a package 416for the individual components.

Nasal Mask Interface

FIG. 25 shows a perspective view of a nasal mask 500 for use with a CPAPor VPAP ventilation system. The mask is preferably triangular shapedwith a plastic concave shell 510 and a seal 512 extending around theperimeter on the concave side (for contacting the face). The seal 512 ispreferably a shape-memory compressible foam member, which is attachableto a posterior base 514 (as shown in FIGS. 26A-26I) of the mask'splastic concave shell 510. The shape-memory compressible foam member canbe either permanently or removably attached to the posterior base 514 ofthe shell.

The seal 512 is generally a strip of approximately ⅜″ to approximately1″ wide, and approximately ½″ to approximately 1⅖″ in height extendingaround the perimeter 516 of the generally triangular shell 510. It canbe appreciated that the face side of the seal 512 is generally a planarsurface; however, it can comprise undulations and curvatures matchingthe general anatomy of the nares or surrounding structures.

Preferably, the foam member of the seal 512 is a viscoelastic foam witha shape memory that is compressibly deformable such that the foammaterial can be compressed against the face without the materialextruding, bending or flexing in directions normal to or diagonal to thecompression direction.

The compressibility (and volumetric reduction) of the foam (withoutextruding sideways) truly allows the seal 512 to compressibly deform tomatch exactly the contours of the face around the nose. The energyabsorptive properties of the foam allow the compressive forces todissipate and spread somewhat evenly throughout the foam, such thatareas requiring more compression (e.g., due to a high point in thefacial anatomy) do not require elevated pressure to be exerted at thatlocation. The same approximate pressure is exerted on the skinregardless of a recess or a protrusion in the anatomy.

The foam surface 518 (as shown in FIG. 26A) can optionally be coated,encapsulated or covered (either completely or at certain locations) witha highly compliant elastomeric membrane for the purpose of hygienicallycontrolling contaminants from entering the foam matrix or forfacilitating cleaning of the foam surface.

Preferably, the surface pores of the foam at certain areas can be sealedwith a compliant sealing substance, or the foam surface can be treatedwith an antimicrobial coating, or other coatings such as creams orhydrophobic, static, or bacteriostatic coatings or the like.

FIGS. 26A-26I show perspective views of a nasal spacer 520 positionedwithin the inferior or lower wall 522 of the foam seal 512. The nasalspacer 520 is positioned away from the opening of the nares to preventnostril occlusion if the mask 500 were to shift during use.

As shown in FIGS. 26A-26I, the nasal spacer 520 can be of a variety offorms, such as (1) a soft compliant Y-shaped or U-shaped prong 530extending superiorly from the inferior wall for hooking the nostrilseptum (FIG. 26E); (2) a superiorly extended boss 532, 534, 536 in themedial region of the seal's inferior wall continuous with the sealmaterial (FIGS. 26A, 26B and 26C, respectively); (3) pockets or reliefs538 in both lateral sides of the seal's inferior wall corresponding tothe nostril locations (FIGS. 26A, 26B and 26C); (4) fenestrated 550(FIG. 26F) or perforated nostril stand-offs 540 (FIG. 26E); (5) a spacerelement 542 extending from the mask shell (FIG. 26H); (6) a T-shapedcross bar 544 (FIG. 26G); (7) a spring memory or malleable shapeablenostril septum clip 546 (FIG. 26I); (8) an elastomeric wall 548 definingthe inferior seal rather than a foam material (FIG. 26G).

On the convex anterior side of the plastic shell a connector 560 islocated, preferably an elbow swivel connector 562, for the purpose ofattaching the mask 500 to a tubing 570 connectable to the gas pressuresource. Fastening the mask 500 to the face can be performed withconventional strap systems 580 or can be performed with a headband 440as shown in FIGS. 23A and 23B.

Routing of the breathing circuit tubing can be performed conventionallyor can be performed with interconnect tubing 570 (FIG. 25) between themask 500 and the breathing circuit connector (not shown) which isconnected to a neck band.

In an alternative embodiment, a separate vacuum line can be applied tothe concave side of the mask shell, thus applying vacuum to that volumewhen the mask is worn so as to assist in exhalation exhausting, CO₂ gasscavenging, enhancing the mask-face seal, or providing activeexhalation. The mask's seal area preferably includes an integral exhaustports extending through the body of the seal 512; the ports may have tobe protected from collapse and pinching when the seal is compressedwhich is preferably accomplished by a pinch-resistant tube extendingthrough the seal width. It can be appreciated that the nasal mask cancomprises any, some or all of the described features.

Hybrid Nasal Interface Tubes-Mask Interface

FIGS. 27A, 27B, 28A, 28B, 29A, and 29B show a front and side view,respectively of three (3) ventilation interface devices 600. The devices600 comprise (1) a mask 500 configured to seal around a portion of thenose including the rim of the nostril or nares; and (2) a pair of nasalinterface tubes 32 configured to seal the nostrils. The interface tubespreferably comprise a distal tip 235 configured to seal the nostril. Theinterface tubes 32 can further include a pair of sealing cushions 46.The hybrid ventilation interface device 600 can be one of the preferredapparatuses or devices for the OSA CPAP user.

As shown in FIGS. 28A, 28B, 29A and 29B, the interface tubes 32 and themask 500 cavity are both pressurized and are thus both connected to agas pressure source, either independently or by utilizing the sametubing and connectors. The mask 500 portion can be relatively smallcompared to conventional masks because there is no worry about the maskedges occluding the nostrils since the nostrils are sealed with theinterface tubes 32 hence assuring air delivery into the nose. The maskportion of the assembly secures the nasal interface tubes 32 in placeand also provides a seal 510 on the face surrounding the nares.

The seal 512 can be performed with either the nasal interface tubes 32with a nostril seal or sealing cushions 46, the mask perimeter facialseal 512, or both which can reduce unintended leaks. In this embodiment,when the system 600 is pressurized, the area outside the nares (insidethe mask) is pressurized coincident with the inside of the nostrilsbeing pressurized (via the interface tubes), hence there will be anpressure equilibrium between the inside and outside of the nose, thushelping to prevent leaks that occur due to pressurized dilation of thenostrils during CPAP.

In a typical nasal interface system, there is a pressure differentialbetween the nasal cavity 590 (which is elevated positive pressure duringCPAP inspiration) and outside the nose (which is ambient pressure)allowing the nostrils to dilate which encourages leakage. In the hybridsystem 600, the trans-nasal-wall pressure is equalized.

In a further embodiment, the mask cavity 590 volume can be pressurizedduring an inspiratory cycle and depressurized during an expiratorycycle, so as to provide easier exhalation effort.

Alternately, the mask cavity 590 volume can be attached to a constant orsemi-constant vacuum signal so as to help remove CO₂ build up in theoverall system 600 or to synchronized to reduce exhalation effort.Alternately, a lower constant pressure level can be applied to the maskcavity 590 volume and a higher constant pressure level applied to thenasal interface tubes 32 with the intention that the interface tubes 32will seal in the nostrils during inspiration but not exhalation (forexample by nasal prong cuff inflation during the inspiratory cycle) thusallowing gas to escape easier during exhalation.

Alternatively only one nostril can be cannulated and/or sealed with asealing cushion 46 from an interface tubes 32 with a NIT which issubstantially sealed in the nostril and through this cannula or tube 32,the nasal cavity is pressurized to the therapeutic pressure level(preferably constantly but optionally intermittently) while the mask'scavity 590 outside the nares is pressurized to a lower exhalationpressure, thus facilitating and easing the work of exhalation out of thenon-cannulated nostril. In this embodiment, it can be appreciated thatthere are a range of combinations, such as cycling pressure in the maskcavity 590 synchronously with the breathing cycle such that duringinspiration the open nostril receives positive pressure gas from themask cavity 590 to prevent flow escapage, but during exhalation the opennostril can receive lower pressure or even negative pressure toencourage exhalation flow.

Alternatively, the side of the nose being cannulated, sealed with asealing cushion 46 and/or used to delivery inspired flow can bealternated throughout the night, for instance in response to nasalresistance shifting from one side to the other. In other aspects of thishybrid mask 600 embodiment, the mask 500 portion of the interface is notpressurized at all. In these embodiments, the mask shell 510 and/or theinterface tubes 32 includes the requisite exhalation exhaust ventfenestrations as is common with conventional interfaces, or can includesome or all of the unique exhalation exhaust mechanisms describedelsewhere in this disclosure. It can be appreciated that the hybridinterface tubes/mask 600 can include any, some or all of the describedfeatures as set forth herein.

Ventilation Interface Head Fasteners

FIGS. 3, 19A and 19B show a method and device for fastening or securinga ventilation interface device 30 to a user's face in a mannercomfortable to the user and convenient to wear and remove. The fasteningis accomplished with two general methods: (1) with straps 74, 78 thathave integral malleable shapeable members 75 that can be shaped by theuser and re-shaped repeatedly, or (2) straps 74, 78 that possess springbehavior or shape memory. FIGS. 19A and 19B show a shapeable fastener orstrap comprising a malleable member 75. Once shaped into a desiredshape, the material within the fastener or strap 74, 78 posses enoughstrength and deformation resistance to resist inadvertent shape changes.

The malleable fastener assembly can possess several differentconfigurations for attaching to the head. As shown in FIGS. 19A and 19B,the fastener or strap assembly 74, 78 can be two bilateral extensionsextending posteriorly from the ventilation interface device 30 whereinthe user shapes the extensions to intimately contact the head asdesired.

Alternatively, as shown in FIGS. 19A and 19B, the fasteners or straps74, 78 can be bilateral extensions as already described however withstraps attached at their posterior ends wherein the straps can be joinedand cinched together at the rear of the head to secure the assembly inplace. The fastener or strap 74, 78 can be an upward extension from theinterface device 30 extending over the top of the head and down the backof the head toward the neck. In this configuration, the portion at thefront of the head (between the eyes) may be very flat and low profile tothe skin allowing the user to wear eyeglasses over the fastener.

The fastener or strap 74, 78 can comprise a quick connect feature on atleast one end for quick and easy fastening to the interface device at ornear the nose and/or at the back of the head, ears or neck band(described in subsequent sections).

Alternatively, the fastener or strap 74, 78 can be fixed to theinterface device at one end and attachable at the other end, or afastener can be fixed to the interface device 30 at one end fastened tosomething else (neckband, ear, or another fastener) at the opposite end.

The fastener or straps 74, 78 are preferably comprised of the malleablematerial preferably surrounded, encased, laminated or otherwise coveredwith a soft compliant material. The malleable material can be copper,nickel, brass or any other suitable material. The cross section of thefastener can be a wire or a plurality of wires, a strip with a flatrectangular cross section, or a round or oval cross section.

The outer covering is preferably a plastic (e.g., soft vinyl), anelastomer (e.g., rubber, synthetic rubber, silicone, and urethane), anda cushion type material (viscoelastic foam). The cushion aspects of themalleable material covering provide comfort and wear-ability of thefastener for the user. The malleable material and the covering can bejoined at their interface to make the materials inseparable and behavein unison or can be loosely associated at their interface to allowrelative motion between the two materials.

Another embodiment described in FIGS. 19A and 19B is a configurationwherein the malleable member is integral to the interface tubes 32, thuscreating giving the interface tubes 32 the added function of a fasteneror strap 74, 78.

Another embodiment of the interface fastener or strap 74, 78 is aconfiguration comprised of both the malleable member and an elasticstrip wherein the malleable member is loosely attached to an elasticstrip such that the elastic provides stretching and elastic tensioningof the fastener, but at the same time the malleable member providesrigidity of the fastener so it stays in the desired position and shape.The member or members can be attached to the elastic band for example bybeing sewn into or onto the elastic band, or can be attached to anelastic band by several fabric loops through which the strip is placed.

FIGS. 19A and 19B show one of the preferable embodiments of the springmemory fastener or strap 74, 78. As shown in FIGS. 19A and 19B, thefastener or strap 74, 78 comprises the same types of extensionconfigurations, connections and padding as previously described. It canbe appreciated that the fasteners or straps 74, 78 preferablyincorporate mixture of features disclosed above can combine flexibility,softness, rigidity where needed, and shapeability.

Ventilation Interface Tubing Securement

FIGS. 3, 19A and 19B also show a method and device for routing andsecuring the gas delivery tubing for the ventilation interface device 30in a manner that reduces the obtrusiveness and inconvenience to theconscious user. Specifically, the fastening method and device comprises(1) a second strap 78 in the form of a neckband that is attached to theneck and made of a soft compliant and optionally stretchable material,and easily fastenable onto the neck such as with Velcro, (2) aninterconnect connector or bifurcation device 61 comprising a T, Y,and/or elbow swivel connector at the anterior aspect of the neck (e.g.,attached to the neckband) with a machine end port and a patient endport, and (3) an interconnect tubing or supply gas hose 64 that connectsthe ventilation interface device 30, nasal mask 500, or hybrid system600 to the patient end of the interconnect connector or bifurcationdevice 61. Tubing leading to the gas pressure source is attached to themachine end of the interconnect connector.

The interconnect connector or bifurcation device 61 is fixed to thesecond strap 78 or neckband and a second connector 60 (usually an elbowdouble swivel connector 60, 62) is attachable to the neckbandinterconnect connector. The interconnect tubes 32 are routed away fromthe interface device 30 (nose or mouth) to the second strap 78 orneckband in a variety of orientations: (1) either to the rear of thehead or neck and then routed along the neck band to the anteriorlylocated interconnect connector, or (2) to the side of the neck where itis fastened to the neck band and then routed to the interconnectconnector, or (3) routed downward from the interface directly to theinterconnect connector on the front of the neck band, or (4) routedupward from the interface over the top of the head and down the back ofthe head to the rear of the neck band, then routed along the neck bandto the located interconnect connector.

The interconnect tubing can be two symmetric tubes on either side of theface, head and/or neck as shown in FIG. 3, or can be a single tube asshown in FIG. 32. The section of the interconnect tubing fastened to thesecond strap 78 can be two symmetric sections of the interface tubes 32,or can be a single tube on one side of the neck as shown in FIG. 32.

In an optional embodiment, the tubing can itself perform the function ofa neckband eliminating the need for a separate strap or neckband. Asection of the interconnect tubing is preferably a flexible andstretchable (such as a corrugated-walled or ridged tube) to allowkink-resistant flexion in response to head and neck movement such thatthe interconnect tubing is not inadvertently disconnected on either end.Part of the interconnect tubing can be fastened to the neckband to helpsecure it in place. Alternatively, the padding can surround part of theinterconnect tubing especially if the interconnect tubing is routed tothe back of the head or neck or the face to make it comfortable to theuser.

It can be appreciated that the tubing routing and fastening systemsserve to control the position of tubing so as to direct it away from,for example, the patient's senses (nose, mouth, eyes or ears) in adesirable orientation that is less obtrusive. The tubing can thus bedirected away from the users senses or field of vision, thus allowingfor more freedom of activities, making it easier to move, and alsominimizing the sensation of having one's face tethered to the gas sourcewith a large tube.

In addition to the neckband interconnect arrangements just described,other optional tubing securement and routing systems can be used toaccomplish the same objective. For example one alternative configurationis an interconnect connector attached to the lapel area or chest area ofa user's night shirt, for example with a grasping clip, or ear lobeclips, thus accomplishing the same objective but without the need for aneck band.

Ventilation Exhaust and Venting

FIGS. 21A, 21B and 21C show an exhalation flow and CO₂ blow-off exhaustports device. As discussed, exhaust ports 370 are preferably arequirement in conventional OSA CPAP interfaces (nasal masks and nasalinterface tubes) whereas they are not required in non-CPAP ventilationbecause non-CPAP ventilation systems include a separate exhalation valvein the system. In the present invention, five different types of exhaustsystems are disclosed; (1) angulated fenestrations axially angulated inthe direction of exhaled flow, (2) an exhaust intake scoop, (3) adirectional flapper valve, (4) a directional sleeve valve, and (5) avacuum assisted exhaust port.

FIGS. 21A and 21B show angulated fenestrations, which are placed in thewall of the nasal interface tubes 32 at or near the base of the sealingcushions 46 (i.e., located outside of the nostrils below the nose). Thefenestrations or vent ports 370 are preferably placed at a diagonalangle 380 so as to direct the air in a downward (inferior) and outward(forward or anterior) direction 382 so that the exhaust flow directionsimulates that of air normally being exhaled from the nose. Thisminimizes annoyance to the user and bed partner. The angulatedfenestrations or vent ports 370 have the added benefit of biasing thedegree of flow resistance such that resistance is low when flow insidethe interface tubes 32 is in the exhaled direction and high when flowinside the interface tubes is in the inhaled direction, because theentrance of to the channels from inside the interface tubes aregenerally parallel with the direction of exhaled flow, but at 180°angles to the direction of inspired flow. Thus, the angulatedfenestrations or vent ports 370 increase the exhaust leak in the “vacuumassisted exhaust systems.”

The vacuum exhaust is preferably created by a separate vacuum line witha distal end communicating with the lumen of the breathing circuit tubeat a location somewhat at or near the patient interface (nasal mask ornasal interface tubes) and a proximal end connected to a vacuumgenerating source. A constant or intermittent vacuum is applied toremove CO rich gas. Preferably, the vacuum can be created by aretrograde (reverse direction) positive pressure jet airflow, which willentrain air to escape with it (i.e., a venturi effect). However, theexhaust system vacuum can be constant, intermittent and/or timed withthe breathing cycle (e.g., on during exhalation phase and off duringinspiration phase). In the venturi system, the venturi pressure sourceand the ventilation gas pressure source can be the same source ordifferent sources.

Portable PGU 700

FIGS. 30 and 31 shows a portable breathing gas pressure generating anddelivery unit 700 (PGU), which is designed to be compact and portablefor travel purposes.

Typically, the conventional PGU's for CPAP and BiPAP applications have avariable speed motor to control a variable speed air blower fan (ABF)and the requisite digital electronics and microprocessors, analogelectronics, sensors and software to control the speed of the motor. Theuser sets the prescribed therapeutic pressure level and the ABF speed isautomatically adjusted as necessary compensating for the prevailingconditions (tubing resistance, etc.) to achieve that pressure.

In the present invention the ABF is not automatically adjusted andinstead the user sets the speed of the motor/ABF manually until thedesired pressure output is achieved. The motor control electronics canthus be made less inexpensive and possibly smaller for more compactness.

As shown in FIGS. 30 and 31, the portable breathing gas pressuregenerating and delivery unit comprises a gas supply hose 702, a gasoutlet tubing connector 704, a pressure regulator 706, a regulatoradjustment 708, a pressure gauge 710, a moisture trap 712, a motor andfan speed selector switch 714, a fan and blower 716, a fan and blowershaft 718, a fan and blower motor 720, a fan and blower gas outlet 722,a fan and blower gas inlet 724, replaceable HEPA filter 726, a powersupply module 728 comprising a rechargeable battery, transformer, fuseand other related components, a power cord 730 for either AC or 12V DCcurrent; an adjustable airway resistance simulator and breathing circuit734 configured such that the user can adjust the pressure output; anairway resistance simulator adjustment device 736 configured to allowthe user to adjust selected high and low resistance, a airway resistancegas outlet 738, an exhalation exhaust flapper valve 740, an accesscompartment for accessing the moisture trap 742, a filter, air inlet andoutlet 744 configured to cool the device, a blower fan outlet checkvalve 746, a blower fan inlet check valve 748, a blower fan bleed tocool the inside of the unit including the motor or blower fan and/orauxiliary inlet to obtain warm air from the motor heat into the blowerand thus entraining into a gas delivered to the use to warm the gas 750,a rubberized surface 752 and a sliding door to protect the controls andconnections 754.

In a second embodiment of the portable PGU 700, a new manner ofcalibrating the pressure output of the PGU 700 to the individual user isdescribed. To facilitate proper pressure output setting, the PGU 700includes an airway resistance simulator test port 756. The user attachesthe distal end of the breathing circuit tube or gas supply hose 702 tothe test port 756 while setting the pressure setting. The resistancesimulator has several settings to properly simulate the resistance ofthe individual's airway or the degree of their airway obstruction. Forexample, if the individual has a very high critical opening pressure oftheir airway, they would set the simulator setting to maximum and incontrast an individual with a low critical opening pressure of theirairway would set the simulator setting to minimum. The simulatorsettings would be for example 1-5, 5 being highest. This way thepressure output is set with the correct resistance in place.

In a third embodiment of the portable PGU 700, optional pressuregenerating mechanisms are described. Besides the conventional rotaryvane blower and fan 716 for generating pressure, the pressure can begenerated by (1) a fan with a concentric motor, (2) a piston pump, (3) aturbine, (4) a centrifugal pump, (5) a gear pump, (6) a rotary pistonpump, (7) an impeller pump, or (8) an dual action piston pump with thesame direction output on both strokes by the use of valves. Also,besides generating flow with the conventional single pump systems, therecan be an array of small pumps, preferably in parallel, so as to creategreater flow output in a smaller overall size, or to alternate betweenpumps where the pump outputs are non-continuous as in a piston pump.

In a forth embodiment of the portable PGU 700 to further facilitateportability, the unit can be powered with a non-120 Volt AC powersource, such as a 12 Volt DC power source (with an internal battery, anexternal battery or cigarette lighter power cord) and is equippedaccordingly. Additionally the unit 700 can be equipped with a chargingsystem, for example a chargeable power storage device (e.g., battery,capacitor) connectable to a power source such as a transformer and/or120/240 Volt AC supply and/or DC supply. The charging system input powercan be attached with a simple conventional connector or can be a dockingstation. Or the chargeable power storage unit can be modular andreplaceable into the PGU 700 and charged outside of the unit 700.Further, the charging of the power storage unit can be a manuallycharging system, such as a manual wind-up system.

In a fifth embodiment of the portable PGU 700, the air being deliveredto the patient can be conditioned in a variety of manners, such asmoisturizing and warming. Warming can be accomplished by collecting warmair that is generated from the ABF or pump motor and inputting it intothe ABF, or by channeling the ABF air output past the motor to warm theair. Moisturization can be accomplished by including a low resistancefilter in the ABF air outlet path wherein the filter can be wetted bythe user so that the air collects moisture on the way to the patient.Further, the moisturizer can be warmed by warm air that is collectedfrom the ABF motor, or alternately can be warmed by a peltier element.In these embodiments the ABF motor is also prevented from overheating doto the bleeding off of heat.

In a sixth embodiment of the portable PGU 700, the unit 700 may alsoinclude an exhalation valve (for example a directional flapper valve)that leaks to atmosphere during exhalation but which is sealed toatmosphere during inspiration. The valve is preferably included near theair outlet of the PGU 700.

In a further embodiment of the portable PGU 700, the unit is constructedwith flush mounted, recessed mounted or cover-protected dials, gauges,connectors and controls to avoid damage to it. This facilitatesreliability and robustness of the unit for traveling use.

In another embodiment of the portable PGU 700, the unit enclosure isruggedized, for example by using polymer or rubber construction of theenclosure, or by surrounding the enclosure with rubber or polymerprotection. The PGU 700 can also include a corrugated air hose that canbe compressed from its full length of 6′-8′ to 1′ to facilitateportability. The PGU 700 can also bleed off room temperature air in theABF to cool the inside of the PGU 700 to prevent overheating. The PGU700 can be super-insulated for noise dissipation and abatement.

It can be appreciated that the PGU 700 comprises all the requisiteregulators, valves, sensors, gauges, conduits, electric wiring, analogand digital electronics. The purpose of these novel features is toprovide a portable PGU 700 that is extremely low cost and smallfootprint such that travelers can easily travel with the equipment andperhaps own a dedicated travel PGU 700 rather than traveling with theirheavier more expensive PGU 700. A typical user would be a frequenttraveler such as a sales representative, persons taking overseas flightsfrequently, or a truck driver who can keep the PGU 700 in the truck anduse it with 12 VDC. It should be noted that any and all of theseembodiments can be combined or mixed as needed.

It can be appreciated that while the various embodiments described areespecially useful for OSA CPAP applications, they are also useful forother non-OSA and non-CPAP applications such as emergency, NIV, COPD,weaning from IMV, or the like.

Alternative Aspects of the Nasal Interface Device

FIG. 32 shows a front view of an alternative embodiment of the nasalinterface device 30. As shown in FIG. 32, the device comprises a gassupply hose 64, a hose coupler 60, a tube 32A and a bifurcated nasalcushion 64A. The nasal cushion 65 comprises a first end configured toattach to the tube 32 and a second end configured to receive a pair ofsealing cushions 64. Alternatively, the second end of the nasal cushioncan be designed with the sealing cushions 64 fixed to the second end ofthe nasal cushion 65.

The nasal cushion 65 is preferably designed to avoid the turbulent flowassociated with the base manifold 20 as shown in FIGS. 1 and 2 byincorporating gradual curves or arcuate design into the nasal cushion65. Preferably, the nasal cushion 65 comprises a pair of lumens 69configured to deliver a ventilation gas to the nostril of the user. Thelumens 69 preferably do not have any 90 degree angles and provide asmooth and arcuate configuration for laminar flow.

The device 30 is secured to the user with a first strap 74 (headband)and a second strap 78 (neckband). As shown in FIG. 32, the device 30 issecured to the neck and then is positioned on or around the jaw of theuser. It can be appreciated that the device 30 can be positioned on oraround the jaw of the user from either side (FIGS. 32 and 33A) of theface to allow the wear to sleep more comfortably on one side or theother. Alternatively, the tube 32 can be an over the head tubeconfiguration secured to the user by known methods of over the headstyle nasal interface cannulae and devices as shown in FIG. 33B.

FIG. 34 shows a cross-section of a first strap 74 or a second strap 78taken along the line F-F of FIG. 32. As shown in FIG. 34, the firststrap 74 or second strap 78 comprises a malleable material 75 preferablysurrounded, encased, laminated or otherwise covered with an outermaterial 77 of a soft compliant nature. The malleable material 75 can becopper, nickel, brass or any other suitable material. Alternatively, themalleable material 75 as shown in FIG. 34 can be a wire or a pluralityof wires, a strip with a flat rectangular cross section, or a round oroval cross section.

The outer material 77 is preferably comprises of a plastic (e.g., softvinyl), an elastomer (e.g., rubber, synthetic rubber, silicone, andurethane), or a cushion type material (viscoelastic foam). The cushionaspects of the outer material 77 provide comfort and wearability of thestraps 74, 78 for the user. The malleable material 75 and the outermaterial 77 can be joined at their interface to make the materialsinseparable and behave in unison or can be loosely associated at theirinterface to allow relative motion between the two materials.

The first strap 74 and the second strap 78 are preferably fastenedbehind the head and/or neck by a Velcro system 174, 178, respectively.However, it can be appreciated that other methods of connecting the endsof the straps 74, 78 can be implemented without departing from theinvention.

FIG. 35 shows a side view of the nasal interface device of FIGS. 32, 33Aand 33B. As shown in FIG. 35, the device 30 is designed to fit closelyand hug the face of the user. The close fit and hugging nature of thedevice 30 provides for as much comfort as possible.

It can be appreciated that the tubes 32 can also include a shape memorymaterial. The shape memory material is created by a preformed shape orby a shape memory member which is integral to at least a portion of thetubing.

The nasal device as shown in FIGS. 3A and 4 have been tested for bothair flow resistance and estimated noise production. Table 1 is a sampleof those test results.

TABLE 1 Air Flow Resistance (cm H₂0 vs. LPM) 30 50 80 ConventionalDevice #1 XS (size) 0.5 1.3 3.1 S 0.5 1.1 2.6 L 0.4 1.0 2.0 XL 0.4 1.01.8 Conventional Device #2 X (size) 0.2 0.5 1.3 S 0.2 0.5 1.1 M 0.2 0.51.1 X 0.2 0.5 1.1 Conventional Device #3 0.2 0.4 1.0 Nasal Device asShown in FIGS. 3A and 4 S (size) 0.2 0.3 0.9 Noise Production (db's at50 LPM - estimated at a 2 to 3 foot distance from the device) Device #145.0 Device #2 50.0 Device #3 not available Nasal Device 42.0

As shown by the test results in Table 1, the nasal interface device 30as shown in FIGS. 3A and 4 provides for reduced air flow resistance as aresult of the laminar flow of the device which delivers the ventilationgas without turbulent flow as known in the prior art. Furthermore, thereduced air flow resistance provides reduced noise production.

FIGS. 36A and 36B describe an alternate embodiment that includes a mouthshield 80, 800 that helps prevent leakage of ventilation gas out of themouth in the event the user is a mouth breather. The shield is a highlycompliant structure that fits between the lips and teeth and on theoutside of the mouth shield can be attached to the cannula tubing. Theshield can include a posterior protrusion 802 that extends behind thefront teeth to facilitate retention in the mouth.

FIG. 37 describes an optional embodiment in which aroma therapy isprovided to calm a user (or other therapeutic uses) by means of areservoir or cartridge release system 810 that releases aroma moleculesinline 812 into the ventilation gas supply. Optionally, the aromatherapy can be provided by simply applying the solution to the cannulaapparatus, for example, while washing.

While the invention has been described in detail with reference to thepreferred embodiments thereof, it will be apparent to one skilled in theart that various changes and modifications can be made and equivalentsemployed, without departing from the present invention.

The invention claimed is:
 1. A nasal ventilation interface for thepurpose of supplying ventilation gas to a person's airway, the interfacecomprising: a generally tubular construction with a distal endconfigured with a first and a second tube for engagement with a person'snostrils and each defining an angulated fenestration in alignment withand directly opposed to a nostril opening, the angulated fenestrationbeing diagonally oriented with respect to a person's face to define anostril airflow direction outward from the face and downward from thenostril, a proximal end configured for attachment to a ventilation gassupply hose; a coupler connecting the first and second distal ends ofthe tubes; and a lifting device applied substantially directly under thenose to the distal end of the first and second tubes, wherein the liftcreates and maintains an upward engagement force between the respectivefirst and second distal ends of the tubes and the nostrils, andmaintains the angulated fenestration oriented along the nostril airflowdirection.
 2. The interface of claim 1, wherein the lifting device is afirst strap attachable to the distal end of the tubes via the coupler.3. The interface of claim 2, wherein the first strap comprises two ends,wherein the two ends extend bilaterally away from the nose and join atthe back or side of the head.
 4. The interface of claim 2, wherein thefirst strap further comprises a malleable member.
 5. The interface ofclaim 2, wherein the first strap further comprises a shape memorymember.
 6. The interface of claim 2, wherein the tension and location ofthe first strap are adjustable.
 7. The interface of claim 2, furthercomprising a facial pad, wherein the facial pad is attachable to thefirst strap and positions the distal end of the interface beneath thenose.
 8. A nasal ventilation interface apparatus for the purpose ofsupplying ventilation gas to a person's airway, the apparatuscomprising: a generally tubular construction with a distal endcomprising a first and second tube configured to engage a person'snostrils and each defining an angulated fenestration in alignment withand directly opposed to a nostril opening, the angulated fenestrationbeing diagonally oriented with respect to a person's face to define anostril airflow direction outward from the face and downward from thenostril, and a proximal end configured to attach to a ventilation gassupply hose, wherein the distal end comprises a facial pad positionedbetween the tubes and skin between the user's nose and upper lip, andwherein the facial pad cushions the user's shin and tilts the distal endof the tubes to maintain the angulated fenestration oriented along thenostril airflow direction and align each of the first tube and thesecond tube with a rim of the user's nostrils.
 9. The apparatus of claim8, wherein the facial pad is comprised of a viscoelastic material andthe pair of tubes are comprised of a plastic material.
 10. The apparatusof claim 8, wherein the facial pad is comprised of an energy absorptionmaterial.
 11. The apparatus of claim 8, wherein the facial pad isadjustable or a variety of facial pad sizes can be interchanged.
 12. Theapparatus of claim 8, wherein the facial pad is integral to a coupler, ahead strap connector, the first and second tubes, or sealing cushions.13. The apparatus of claim 8, wherein the facial pad is attached to ahead strap connector with a hinge.
 14. A nasal ventilation interfaceapparatus for the purpose of supplying ventilation gas to a person'sairway comprising: a generally tubular construction with a distal endcomprising a first and a second tube configured to engage a person'snostrils and each defining an angulated fenestration in alignment withand directly opposed to a nostril opening, the angulated fenestrationbeing diagonally oriented with respect to a person's face to define anostril airflow direction outward from the face and downward from thenostril, and a proximal end configured to attach to a ventilation gassupply hose, a band member substantially circumventing the head from thechin to the top of the head, wherein the band member applies upwardcompression on the chin so as to bias the mouth in a close state, and afirst connector between the first tube and the band member and a secondconnector between the second tube and the band member, wherein the firstconnector and the second connector apply an upward lifting force ondistal ends of the first tube and the second tube to maintain a sealwith the nostrils, and maintain the angulated fenestration orientedalong the nostril airflow direction.
 15. The apparatus of claim 14,wherein the hand member provides an upward force on the distal end firstand second tubes, wherein the force maintains compression between thenostrils and the distal ends of the first and second tubes wherein thecompression substantially seals the first and second tubes to thenostrils.
 16. The apparatus of claim 14, wherein the distal end of thetubes is generally circular and comprises an inner diameter generallyapproximately equal to or less than the diameter of the nostril openingof the user.
 17. The apparatus of claim 16, wherein the distal end ofthe tubes has an inner diameter of about 6 mm to about 22 mm.